In modern homes, this really is unlikely to be possible due to space limitations, though traditionally, fireplaces were considered to be the best central element to the living room! But it's important to remember that the goal of your living room is being inviting to people, to get them to feel comfortable and relaxed, and stimulate good conversation. So even without a central fireplace, making the fireplace some sort of center of attention will also work well. Mirrors are a wonderful tool to enhance Feng Shui in a living room. They bring light into darker areas and may reflect aspects of the space that visitors might not exactly otherwise enjoy. Mirrors make rooms look larger (and lighter) and very usefully, they can reflect the door, so any seating that cannot face the door can still have the door visible through the use of mirrors. Just as before, we need to adapt this principle to modern cities and homes, even though the best placement for a mirror is how it can reflect a lovely view.